import { MessageSerializer, ValidationError } from '@/types';

/**
 * JSON serializer implementation
 */
export class JSONSerializer implements MessageSerializer {
  private readonly options: {
    space?: number;
    replacer?: (key: string, value: unknown) => unknown;
    reviver?: (key: string, value: unknown) => unknown;
  };

  constructor(
    options: {
      space?: number;
      replacer?: (key: string, value: unknown) => unknown;
      reviver?: (key: string, value: unknown) => unknown;
    } = {}
  ) {
    this.options = options;
  }

  serialize(data: unknown): string {
    try {
      return JSON.stringify(data, this.options.replacer, this.options.space);
    } catch (error) {
      throw new ValidationError(`JSON serialization failed: ${error}`);
    }
  }

  deserialize(data: string): unknown {
    try {
      return JSON.parse(data, this.options.reviver);
    } catch (error) {
      throw new ValidationError(`JSON deserialization failed: ${error}`);
    }
  }
}

/**
 * MessagePack serializer implementation (requires msgpack dependency)
 */
export class MessagePackSerializer implements MessageSerializer {
  serialize(data: unknown): string {
    try {
      // Note: This would require the 'msgpack' package
      // const msgpack = require('msgpack');
      // const buffer = msgpack.pack(data);
      // return buffer.toString('base64');

      // Fallback to JSON for now
      return JSON.stringify(data);
    } catch (error) {
      throw new ValidationError(`MessagePack serialization failed: ${error}`);
    }
  }

  deserialize(data: string): unknown {
    try {
      // Note: This would require the 'msgpack' package
      // const msgpack = require('msgpack');
      // const buffer = Buffer.from(data, 'base64');
      // return msgpack.unpack(buffer);

      // Fallback to JSON for now
      return JSON.parse(data);
    } catch (error) {
      throw new ValidationError(`MessagePack deserialization failed: ${error}`);
    }
  }
}

/**
 * Avro serializer implementation (requires avro-js dependency)
 */
export class AvroSerializer implements MessageSerializer {
  private readonly _schema: unknown;

  constructor(schema: unknown) {
    this._schema = schema;
  }

  serialize(data: unknown): string {
    try {
      // Note: This would require the 'avro-js' package
      // const avro = require('avro-js');
      // const type = avro.parse(this.schema);
      // const buffer = type.toBuffer(data);
      // return buffer.toString('base64');

      // Fallback to JSON for now
      return JSON.stringify(data);
    } catch (error) {
      throw new ValidationError(`Avro serialization failed: ${error}`);
    }
  }

  deserialize(data: string): unknown {
    try {
      // Note: This would require the 'avro-js' package
      // const avro = require('avro-js');
      // const type = avro.parse(this.schema);
      // const buffer = Buffer.from(data, 'base64');
      // return type.fromBuffer(buffer);

      // Fallback to JSON for now
      return JSON.parse(data);
    } catch (error) {
      throw new ValidationError(`Avro deserialization failed: ${error}`);
    }
  }
}

/**
 * Protocol Buffers serializer implementation (requires protobufjs dependency)
 */
export class ProtobufSerializer implements MessageSerializer {
  private readonly _messageType: unknown;

  constructor(messageType: unknown) {
    this._messageType = messageType;
  }

  serialize(data: unknown): string {
    try {
      // Note: This would require the 'protobufjs' package
      // const message = this.messageType.create(data);
      // const buffer = this.messageType.encode(message).finish();
      // return buffer.toString('base64');

      // Fallback to JSON for now
      return JSON.stringify(data);
    } catch (error) {
      throw new ValidationError(`Protobuf serialization failed: ${error}`);
    }
  }

  deserialize(data: string): unknown {
    try {
      // Note: This would require the 'protobufjs' package
      // const buffer = Buffer.from(data, 'base64');
      // const message = this.messageType.decode(buffer);
      // return this.messageType.toObject(message);

      // Fallback to JSON for now
      return JSON.parse(data);
    } catch (error) {
      throw new ValidationError(`Protobuf deserialization failed: ${error}`);
    }
  }
}

/**
 * Compressed JSON serializer using gzip
 */
export class CompressedJSONSerializer implements MessageSerializer {
  private readonly jsonSerializer: JSONSerializer;

  constructor(jsonOptions?: ConstructorParameters<typeof JSONSerializer>[0]) {
    this.jsonSerializer = new JSONSerializer(jsonOptions);
  }

  serialize(data: unknown): string {
    try {
      const jsonString = this.jsonSerializer.serialize(data);

      // Note: This would require the 'zlib' module for compression
      // const zlib = require('zlib');
      // const compressed = zlib.gzipSync(jsonString);
      // return compressed.toString('base64');

      // For now, just return the JSON string
      return jsonString;
    } catch (error) {
      throw new ValidationError(`Compressed JSON serialization failed: ${error}`);
    }
  }

  deserialize(data: string): unknown {
    try {
      // Note: This would require the 'zlib' module for decompression
      // const zlib = require('zlib');
      // const buffer = Buffer.from(data, 'base64');
      // const decompressed = zlib.gunzipSync(buffer);
      // const jsonString = decompressed.toString('utf8');
      // return this.jsonSerializer.deserialize(jsonString);

      // For now, just deserialize as JSON
      return this.jsonSerializer.deserialize(data);
    } catch (error) {
      throw new ValidationError(`Compressed JSON deserialization failed: ${error}`);
    }
  }
}

/**
 * Serializer factory for creating serializers by type
 */
export class SerializerFactory {
  private static readonly serializers = new Map<string, () => MessageSerializer>([
    ['json', () => new JSONSerializer()],
    ['msgpack', () => new MessagePackSerializer()],
    ['compressed-json', () => new CompressedJSONSerializer()],
  ]);

  static register(type: string, factory: () => MessageSerializer): void {
    this.serializers.set(type, factory);
  }

  static create(type: string): MessageSerializer {
    const factory = this.serializers.get(type);
    if (!factory) {
      throw new ValidationError(`Unknown serializer type: ${type}`);
    }
    return factory();
  }

  static getAvailableTypes(): string[] {
    return Array.from(this.serializers.keys());
  }
}

// Default serializer instance
export const defaultSerializer = new JSONSerializer();

// Utility functions for serialization
export const serialize = (
  data: unknown,
  serializer: MessageSerializer = defaultSerializer
): string => {
  return serializer.serialize(data);
};

export const deserialize = (
  data: string,
  serializer: MessageSerializer = defaultSerializer
): unknown => {
  return serializer.deserialize(data);
};

// Type-safe serialization helpers
export const serializeTyped = <T>(
  data: T,
  serializer: MessageSerializer = defaultSerializer
): string => {
  return serializer.serialize(data);
};

export const deserializeTyped = <T>(
  data: string,
  serializer: MessageSerializer = defaultSerializer
): T => {
  return serializer.deserialize(data) as T;
};
